Etajima island is home to Japan's Naval Academy officially called the Japanese Maritime Self Defense Force First Service School (海上自衛隊第1術科学校), akin to Annapolis in the US. It originally opened as the Imperial Naval Academy in 1888. The Naval Academy conducts free guided tours of the school 3 or 4 times a day. The main attraction for me was the display of a midget submarine used in the Pearl Harbor attack. For more info see the academy's Web site here.